Fault-zone weakening processes along the reactivated Outer Hebrides fault zone, Scotland

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doi: 10.1144/gsjgs.154.1.0105
Authors:Imber, J.; Holdsworth, R. E.; Butler, C. A.; Lloyd, G. E.
Author Affiliations:Primary:
University of Durham, Department of Geological Sciences, Durham, United Kingdom
University of Durham, United Kingdom
University of Leeds, United Kingdom
Volume Title:role of basement reactivation in continental deformation
Volume Authors:Butler, R. W. H., editor
Source:Journal of the Geological Society of London, Vol.154 (Part 1), p.105-109; Discussion meeting on The role of basement reactivation in continental deformation, Burlington House, United Kingdom, March 6-7, 1996, edited by R. W. H. Butler, R. E. Holdsworth and G. E. Lloyd. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1997
Note:In English. 24 refs.; illus., incl. 1 table, sketch map
Summary:The Outer Hebrides fault zone is a major reactivated structure cutting amphibolite-grade Lewisian basement gneisses. During a regionally important phase of sinistral strike-slip movements, the influx of chemically active hydrous fluids along the fault zone was associated with the formation of a network of greenschist-facies phyllonitic shear zones, into which later ESE-directed extensional strain was preferentially focused. The syn-tectonic alteration of a relatively strong, feldspar-hornblende-dominated load-bearing framework microstructure to an interconnected weak layer microstructure of fine-grained, strongly aligned phyllosilicate aggregates leads to the long-term weakening in the fault zone. [R.A.H.]
Subjects:Basement tectonics; Fault zones; Faults; Kinematics; Metamorphic rocks; Metamorphism; Microstructure; Phyllonites; Phyllonitization; Reactivation; Rheology; Shear zones; Syntectonic processes; Tectonics; Europe; Great Britain; Hebrides; Outer Hebrides; Scotland; United Kingdom; Western Europe
Abstract Numbers:97M/3009
Record ID:1997056632
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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